Garcia-Burillo, S., Combes, F., Usero, A., Aalto, S., Krips, M., Viti, S., Alonso-Herrero, A., Hunt, L. K., Schinnerer, E., Baker, A. J., Boone, F., Casasola, V., Colina, L., Costagliola, F., Eckart, A., Fuente, A., Henkel, C., Labiano, A., Martin, S., Marquez, I., Muller, S., Planesas, P., Ramos Almeida, C., Spaans, M., Tacconi, L. J. and van der Werf, P. P. (2014). Molecular line emission in NGC 1068 imaged with ALMA I. An AGN-driven outflow in the dense molecular gas. Astron. Astrophys., 567. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Aims. We investigate the fueling and the feedback of star formation and nuclear activity in NGC 1068, a nearby (D = 14 Mpc) Seyfert 2 barred galaxy, by analyzing the distribution and kinematics of the molecular gas in the disk. We aim to understand if and how gas accretion can self regulate. Methods. We have used the Atacama Large Millimeter Array (ALMA) to map the emission of a set of dense molecular gas (n(H-2) similar or equal to 10(5-6) cm 3) tracers (CO(3-2), CO(6-5), HCN(4-3), HCI+(4-3), and CS(7-6)) and their underlying continuum emission in the central r similar to 2 kpc of NGC 1068 with spatial resolutions similar to 0.3-0.5 (similar to 20-35 pc for the assumed distance of D = 14 Mpc). Results. The sensitivity and spatial resolution of ALMA give an unprecedented detailed view of the distribution and kinematics of the dense molecular gas (n(H-2) >= 10(5-6)cm(-3)) in NGC 1068. Molecular line and dust continuum emissions are detected from a r similar to 200 Pe off-centered circumnuclear disk (CND), from the 2.6 kpc-diameter bar region, and from the r similar to 1.3 kpc starburst (SB) ring. Most of the emission in HCO+, HCN, and CS stems from the CND. Molecular line ratios show dramatic order-of-magnitude changes inside the CND that are correlated with the UV/X-ray illumination by the active galactic nucleus (AGN), betraying ongoing feedback. We used the dust continuum fluxes measured by ALMA together with NIR/MIR data to constrain the properties of the putative torus using CLUMPY models and found a torus radius of 20(-10)(+6) pc. The Fourier decomposition of the gas velocity field indicates that rotation is perturbed by an inward radial flow in the SB ring and the bar region. However, the gas kinematics from r similar to 50 pc out to r similar to 400 pc reveal a massive (M-mol similar to 2,7(-1.2)(+0.9) x 10(7) M-circle dot) outflow in all molecular tracers. The tight correlation between the ionized gas outflow, the radio jet, and the occurrence of outward motions in the disk suggests that the outflow is AGN driven. Conclusions. The molecular outflow is likely launched when the ionization cone of the narrow line region sweeps the nuclear disk. The outflow rate estimated in the CND, (dM/dt similar to 63 M-circle dot yr(-1), is an order of magnitude higher than the star formation rate at these radii, confirming that the outflow is AGN driven. The power of the AGN is able to account for the estimated momentum and kinetic luminosity of the outflow. The CND mass load rate of the CND outflow implies a very short gas depletion timescale of <= 1 Myr. The CND gas reservoir is likely replenished on longer timescales by efficient gas inflow from the outer disk.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Garcia-Burillo, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Combes, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Usero, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aalto, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krips, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Viti, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso-Herrero, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hunt, L. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schinnerer, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baker, A. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boone, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Casasola, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Colina, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Costagliola, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eckart, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuente, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henkel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Labiano, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marquez, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muller, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Planesas, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ramos Almeida, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Spaans, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tacconi, L. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Werf, P. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-435161
DOI: 10.1051/0004-6361/201423843
Journal or Publication Title: Astron. Astrophys.
Volume: 567
Date: 2014
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ACTIVE GALACTIC NUCLEUS; SPECTRAL ENERGY-DISTRIBUTION; NEARBY SEYFERT-GALAXIES; WATER MASER EMISSION; NARROW-LINE; STAR-FORMATION; BLACK-HOLES; X-RAY; SPATIAL-RESOLUTION; QUASAR FEEDBACKMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43516

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